std::difftime

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C++ Standard Library
Utilities library
Date and time utilities
C-style date and time utilities
Functions
Time manipulation
difftime
time
clock
Format conversions
asctime
ctime
strftime
wcsftime
gmtime
localtime
mktime
Constants
CLOCKS_PER_SEC
Types
tm
time_t
clock_t
Defined in header <ctime>

double difftime( time_t time2, time_t time1 );

Computes difference between two calendar times as time_t objects (time2 - time1) in seconds.

Contents

[edit] Parameters

time1, time2 - times to compare

[edit] Return value

difference between two times in seconds

[edit] Example

#include <iostream>
#include <ctime>
int main()
{
    std::time_t start = std::time(NULL);
    volatile double d;
    for(int n=0; n<10000; ++n)
       for(int m=0; m<100000; ++m)
           d += d*n*m; // some time-consuming operation
    std::cout << "Wall time passed: " << std::difftime(std::time(NULL), start) << " s.\n";
}

Output: 

Wall time passed: 7 s.

[edit] See also

(C++11)
 a time interval
(class template)
Retrieved from "http://en.cppreference.com/w/cpp/chrono/c/difftime"
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